|Relative key||B minor|
|Parallel key||D minor|
|Dominant key||A major|
|D, E, F♯, G, A, B, C♯, D|
D major (or the key of D) is a major scale based on D, consisting of the pitches D, E, F♯, G, A, B, and C♯. Its key signature consists of two sharps. Its relative minor is B minor and its parallel minor is D minor.
D major is well-suited to violin music because of the structure of the instrument, which is tuned G D A E. The open strings resonate sympathetically with the D string, producing a sound that is especially brilliant. This is also the case with all other orchestral strings.
It is thus no coincidence that many classical composers throughout the centuries have chosen to write violin concertos in D major, including those by Mozart (No. 2, 1775, No. 4, 1775); Ludwig van Beethoven (1806); Paganini (No. 1, 1817); Brahms (1878); Tchaikovsky (1878); Prokofiev (No. 1, 1917); Stravinsky (1931); and Korngold (1945).
It is appropriate for guitar music, with drop D tuning making two Ds available as open strings. For some beginning wind instrument students, however, D major is not a very suitable key, since it transposes to E major on B-flat wind instruments, and beginning methods generally tend to avoid keys with more than three sharps.
Even so, the clarinet in B-flat is still often used for music in D major, and it is perhaps the sharpest key that is practical for the instrument. There are composers however who, in writing a piece in D minor with B-flat clarinets, will have them change to clarinets in A if the music switches to D major, an example being Rachmaninoff's Third Piano Concerto.
In the Baroque period, D major was regarded as "the key of glory"; hence many trumpet concertos were in D major, such as those by Fasch, Gross, Molter (No. 2), Leopold Mozart, Telemann (No. 2), and Giuseppe Torelli. Many trumpet sonatas were in D major, too, such as those by Corelli, Franceschini, Purcell, and Torelli. "The Trumpet Shall Sound" and the "Hallelujah" chorus from Handel's Messiah, and his coronation anthem Zadok the Priest are in D major.
23 of Haydn's 104 symphonies are in D major, making it the most often used main key of his symphonies. The vast majority of Mozart's unnumbered symphonies are in D major, namely K. 66c, 81/73, 97/73m, 95/73n, 120/111a and 161/163/141a. The symphony evolved from the overture, and "D major was by far the most common key for overtures in the second half of the eighteenth century." This continued even into the Romantic Period, and was used for the "triumphant" final movements of several symphonies, including Beethoven's Ninth Symphony, Gustav Mahler's Titan symphony, Jean Sibelius' Second Symphony and Johann Strauss I Radetzky March.
The bells of Westminster Abbey are tuned to the key of D major
|Diatonic scales and keys|
|The table indicates the number of sharps or flats in each scale. Minor scales are written in lower case.|
- Rita Steblin: A History of Key Characteristics in the Eighteenth and Early Nineteenth Centuries (Rochester, University of Rochester Press: 1996) p. 124 "The key of triumph, of Hallelujahs, of war-cries, of victory-rejoicing."
- Rice, John (1998). Antonio Salieri & Viennese Opera. Chicago: University of Chicago Press. p. 124.
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